I've removed "Carrie" by Stephen King from the list because...come on, seriously?

lol

I need help. I have been looking for a book. I know the plot but for the life of me I cant remember the title or author.
It's a young woman who comes back to England with her brother and sister. She took them on a tour of the continent to protect them from cousin who killed the father and almost the brother. He killed the yonger sisters fiancee before they could marry to protect her inheritance.
A military officer makes a bet with his friends he would ask the next lady tru the door to marry him. Her sister was first so he was with his jr. Officer to speakto them. He goes to the older sister because the younger seemed scared pf him his jr.O ends up falling in love with the younger. Sis. Sr.Officerbfalls for older sister. He offers his assistane protecting her siblings a m d herwhile helping to convict cousin of fathers death also to stop his slave smuggling. I thought it had Guardian or protector in the title but for a week now I cant find it. I hope someone can help
Me find rirlw or author so I can buy it it is frustrating if more of the story will help, Oh the brother is titled and they have with oaks or pines as the main product. Any help is appreciated.

Have you tried the group What's the Name of that Book?

I wouldn't exactly call Sophy (The Grand Sophy, #92) a 'Spinster, Wallflower or Old Maid'. Far from it, actually :-)

Bridget wrote: "I need help. I have been looking for a book. I know the plot but for the life of me I cant remember the title or author.
It's a young woman who comes back to England with her brother and sister. Sh..."

Did you ever find out the title? You make the story sound interesting, now I want to check it out.

@Elizabeth
Please don't use this section, or the Listopia for that matter, to promote your own books...